20749104 has 60 divisors (see below), whose sum is σ = 58757400. Its totient is φ = 6834432.

The previous prime is 20749103. The next prime is 20749117. The reversal of 20749104 is 40194702.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20749103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12007 + ... + 13625.

It is an arithmetic number, because the mean of its divisors is an integer number (979290).

Almost surely, 2^20749104 is an apocalyptic number.

20749104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20749104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29378700).

20749104 is an abundant number, since it is smaller than the sum of its proper divisors (38008296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20749104 is a wasteful number, since it uses less digits than its factorization.

20749104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722 (or 1713 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20749104 is about 4555.1184397335. The cubic root of 20749104 is about 274.7892776910.

The spelling of 20749104 in words is "twenty million, seven hundred forty-nine thousand, one hundred four".